Street-sweeping machine.



s. c. HARTMAN. STREET SWEEPING MACHINE.

APPLICATION FILED MAR. 17- I916.

I aw M N X m w rm. xx QN xw rfi 5::

Patented June 5, 1917.

3 SHEETS-SHEET I wi/tmaoo s. c. HART'MAN.

STREET SWEEPING MACHINE.

ICATION FILED MAR-17, l9l6.

1.,Q28fi73 PL Patented June 5, 1917.

'3 SHEET sssssss 2.

s. c. HARTMAN.

,STREET SWEEPING MACHINE.

APPLICATION FILED MAR. 17. l9l6.

3 SHEETS-SHEET 3.

Patented June 5,1917.

SAMUEL C. HAETMAN, OF DAYTON, oni'o.

STBEET-SWEEPING MACHINE.

Specification of Letters Patent.

Patented June 5, 1917.

Application filed March 17, 1918. Serial No. 84,763.

' To all whom it may concern:

Be it known that I, SAMUEL G. Han'rMAN, a citizen of the United States, res1d1ng at Dayton, in the county of Montgomery and State of Ohio, have invented certain new anduseful Improvements in Street-Sweeping-Machines; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

This invention relates to new and useful improvements in street sweeping machines and the object of said invention is to produee a street sweeping machine which is attachable to the'back end of a wagon and has a capacity for delivering into the said wagon the sweepings from the street as well as the dust incidental to the sweeping of the street. To; these ends the invention in general terms comprises a series of sweepers which combine to sweep the dirt from the street in a most thorough manner and other means for controlling the dirt swept or collected from the street and discharging it into the wagon. Other features or devices are arranged to contribute to the functions of the sweepingdevices, such as blowers which are arranged in the rear of the main brushes, and certain other specific devices all as will be hereinafter more fully described in connection with the accompanyin drawings.

ieferring briefly to the accompanying drawings, Figure 1 is a longitudinal vertical sectional elevation through the sweeping apparatus showing the same coupled to a wagon a portion onl of the latter being shown; Fig. 1 is a si e elevation of the machine showing the gearing between the axle of the supporting wheels and the brush axle and the various transmission shafts. Fig. 2 is a longitudinal sectional elevation through the axes of the main sweeping brushes, said section being on the line 2-2 of Fig. 1; Fig. 3 is a longitudinal sectional view of a conveyer pulley and a right and left hand screw mounted adjacent thereto, said section being on the line 33 of Fig. 1; Flg. 4 is a bottom plan. view of the center sweeper which moves in the front of the main revolving sweepers; Figs. 5 and 6 are a plan and elevation respectively of the curb sweeper which is mounted on the right hand slde of the sweeper frame in a position to sweep the street at the curbs; Fig. 7 is a deta1l plan view showingthe manner of mounting the ends of the main rotary brushes; Fig. 8 is a detail plan view show-- 1ng one'of the dirt guides or dust pans and the adjustable support thereof; Fig. 9 is a plan view of the dirt guides which direct the dirt from the main sweeper onto the initial conveyer; and Fig. 10 is a detail crosssectional view of the main sweeper showing a modified form of blower through which. the air is directed under and above the sweeper.

In a detail description of my invention, similar reference characters indicate corresponding parts.

In the drawings, I have illustrated a por t1on of the wagon or cart which receives the dirt from the street swept thereinto by my improved street sweeping apparatus. ,As shown in Fig. 1, 1 designates the rear end of the body of the wagon to which the sweeper is connected by means of a suitable coupling device 2. The sweeping apparatus consists of a rectangular casing or box 3 of a suitable capacity to house the various devices to be described and the same is supported upon two tractors 4 mounted upon an axle 5 of suitable form and provided with suitable bearings such as boxes 6. Of course it will be understood that various changes may be made in the matter of the casing and other parts that do not involve the essence of the invention and such parts need only to be briefly mentioned as the description proceeds.

Referring now to the main sweeper, in the present instance this is shown to consist of three sections which are duplicates one of the other and are designated by the reference character7'. All of these sections rotate on a common axle or shaft 8 which is mounted in suitable bearings in the casing 3 and each of such sweeper sections is constructed as follows :-9 designates a disk from which radiates a series of boxes or guides 10. These boxes or guides 10 each ends of the guide pins'12 said pins being ture shown in Fig. 7 shows the abutting ends of two brushes 11. The ends of said brushes are shown connected to the pins 12 which lie between the bottoms or inner 'walls 14 of the disks 9 and the outer walls 17 of said disks. The brushes so mounted on the axle 8 are driven from the wheel axle 5 as follows:

Motion is given off the wheel axle 5 through means of a sprocket wheel 18 thereon which is connected to a sprocketv wheel 19 on shaft 20 through a chain'21. The

fined wholly tothe brushes.

shaft 20 has a gear 22 which meshes with a gear on a counter shaft 24 which lies parallel with the shaft 20. On the shaft 24 a chain wheel 25 transmits motion to the brush shaft 8 through means of achain 26 which engages a sprocket wheel 27 on the brush shaft 8. Moving along rearward of the brushes so mounted on shaft 8 is an air discharge casing 28 which lies below the brushes and adjacent to each brush as it engages the street. Air is discharged through this casing 28 the outlet opening therein being substantially the width of the entire assembled brushes on the shaft 8. Air is fed into the casing 28 through a pipe 29 which communicates with a casing 30 in which a rotating blower 31 is mounted on a shaft 32. The blower 31 is driven at a high speed from the shaft 20 through a sprocket wheel 33 and chain 34 the latter being connectedwith a sprocket wheel 35 on the blower shaft 32. It is conceivable that much dust will necessarily be: created adjacent the revolving brush or brushes and it is the object and purpose of the air device just described to control this dust and keep it under the control of the brushes. In Fig. 10 a modification of the air casing 28 is shown consisting of two air outlet spouts 36 and 37 respectively, one of which extends below the rearward. side of the brushes and the other of which extends and projects above said brushes. The effect of this arrangement is to keep the rising dust con- It will be noted that in addition to the air outlets 36 and 37, there is a central outlet 38 in the rear of the brushes. It may be stated here that the air casing 28 or the modification thereof as shown in Fig. 10, may extend wholly across the assembled brushes as they are shown in Fig. 2 or they may be constructed in individual parts one of which is confined to each brush as they are assembled .on the shaft 8. Referring further to Fig.

10, on the interior of the casing two wings 39 and 40 are-mounted upon a common shaft 41 the ends of which are provided with bearings in the side walls of the cas- I ing. This device is in the form of a butterfly valve and it may be rotated to shut off the passage of air through one or the other of the outlet spouts 36 or 37. It is operated in this manner by means of a connection 42 an end of which is connected to an adjusting rod 43 having a suitable bearing in the casingand a spring 44 which exerts pressure to maintain the wings 39 and 40 in the position shown in Fig. 10 in which position the air is permitted to pass into each of said spouts. The outer end of the rod 43 is screw-threaded as at 45 and is provided with an adjusting nut 46 by means of which the adjustment referred to is obtainable. Having described the operation of the brushes and the manner of introducing the air to control the rising dust, I now refer to a series of dust pans or dirt ides 47 one of which is arranged in a positionfor the brushes to sweep the dirt up onto an endless conveyer 48 to be again referred to. The dust pans 47 are 'shown in Fig. 9 to abut at their ends and to be each mounted upon a rod 49 having suitable end bearings.

Upon these rods 49 rollers 50 are mounted which engage the street and reducethe friction incidental upon such engagement while the machine is moving and at the same time lie close to the surface ofthe street in order to avoid any chance for the dirt or dust to pass under the said dust pans. The dust pans 47 are each mounted upon an adjustable arm or bracket 51 which extends forward and is rigidly mounted upon a cross bar 52, said bar 52 being of a pivotal character and adapted to be operated from a hand lever 53 to bring the dust pans or guides 47 in a proper position relative to the endless conveyer 48.- The bars 51 have longitudinal slots 51 which coiiperate in effecting the proper adjustments of the dust pans. The conveyer 48 is mounted upon rollers 54 and 55, the latter being the driving roller and both of said rollers being*mounted upon shafts which have suitable bearings in'the casing 3. The shaft 56 of the roller 55 car rieS a sprocket wheel 57 which is driven from a chain 58 from a sprocket wheel 59 on the shaft 20, which 'we have seen is driven from the main axle 5 of the apparahis The conveyer 48 receiving the dirt from the pans 47 discharges it into an upper hood or casing 60 which is made secure within the casing 3 and from this hood 60 the dirt is'discharged onto a right and left splral conveyer 61 onto a conveyer 62 which extends out of the front portion of the sweeper casing 3. The conveyer 62 is mounted within a casing 63 upon an inner roller 64 and an outer end roller 65. The inner roller 64 is mounted upon a shaft 66 which is driven from the spiral conveyer 61 through a sprocket chain 67 which passes around a sprocket wheel 68 on said shaft 66. It may be here stated that the spiral conveyer 61 is in a like manner driven from the sprocket chain 57 from the shaft 56, before referred to, in connection with the conveyer 48. The conveyer casing 63 is mounted upon frame members 72 which.are pivoted at each side to pivots 74 on a bracket 73. The bracket 73 has also a vertical pivot 75 on a bracket 76 mounted upon a cross frame member 77 in the forward end of the casing 3. Such a double pivot of the conveyer and its casing 63 is necessary for the reason that it has to be operated to insure a proper connection between the spout 7 8 thereof and the inlet spout 7 9 of the wagon body which is shown in Fig. 1. The conveyer casing 63 is elevated and swung in a proper position in making this connection by means of the Windlass 80 and a rope 81 forming a connection between the casing 63 and the Windlass. This universal connection for the conveyer 62 renders it expedient to provide a flexible feature of the conveyer shaft 66 which is in the form of a flexible shaft 70 having a suitable alining connection with the shaft 66, and a shaft 69, as shown in Fig. 3. In advance of the rotating brushes 11 there is arranged a series of brushes 93 which direct the dirt to the center of the machine. These brushes 93 are mounted upon a drag-frame 92 which is connected to the casing of the machine by four levers 94, one being at each corner of the drag frame 9 and extending on the outside of the casing 3 to which they are pivoted. The drag-frame thus construoted and connected with the casing 3 is operated or lowered by means of a hand lever 95 which is shown in dotted lines in Fig. 1. It will be observed from Fig. 4 that the brushes 93 converge each to the center of the frame 92, one in advance of the other, so that in moving" along the ground the dirt to be acted upon by the rotating brushes will be thrown in the path thereof. There is also provided a suitable sweeper which is made use of to sweep the street along the curb, or places where the usual main brush of a sweeper cannot reach effectively. This curb sweeper or brush is shown in Figs. 5 and 6 where it is designated by 84 as being mounted on an angle in the frame 82 which is hinged to the right side of the asing 3 adjacent to the corner thereof. The frame 82 being thus connectedby means of hinges 83, may be elevated from the ground and therewith the sweeper 84 when not in use. It is maintained in such elevated position by means of a latch 96 which hooks over the outer end of the frame 82. As shown in the figures referred to, the curb sweeper 84 is lowered and in such position it is driven from a vertical shaft 87 journaled on the side of the casing 3 in upper and lower bearings 88. The shaft of the brush 84 has a bevel gear which eration of the apparatus will be readily understood.

Without desiring to limit myself to any unnecessary structural parts as above defined, I claim as my invention:

1. In a street sweeping machine, the com- I bination with a carrying frame, of a rotating sweeper mounted in said frame, an air pipe in the rear of said sweeper terminating in discharge nozzles above and below said sweeper, and a traveling conveyer adapted to receive the sweepings from said sweeper, v

substantially as specified. I d

2. In a street sweeping machine, the combination with a carrying frame, ofarotating sweeper mounted in said frame, an air pipe in the rear of said sweeper terminating in discharge nozzles above and below said sweeper, means for controlling the discharge of air from said air pipe to said nozzle, and a traveling conveyer adapted'to receive the sweepings from said sweeper, substantially as specified.

3. In a street sweepin machine, the combination of a casing, and arotatablesweeper mounted therein, an air discharge pipe in the rear of said sweeper terminating in discharge spouts which project above and'below the sweeper, means. mounted in said discharge pipe at the entrance of said spouts for controlling the passage of air thereto, means for controlling the position of said air-discharge-controlling means, and a conveyer to carry the sweepings from the sweeper, substantially as specified.

In testimony whereof I aifix my signature, in presence of two witnesses 

